Back vest



FIG. 1 is a rear perspective view of a back vest of conventional thickness showing my new design in use, the broken lines partially showing a human form being for illustrative purposes only and forming no part of the claimed design, and the broken lines on the claimed vest throughout the views are understood to represent conventional stitching;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a rear elevational view thereof.

The rectangular tabs on the upper straps are understood to represent conventional hook and loop closures. 

The ornamental design for as back vest, as shown and described. 